Phlight Restaurant & Wine Bar in Uptown Whittier is the only serious option besides the Golden Triangle. Phlight is sophisticated and innovative, serving mostly "small plates" that are tasty in a "fusion" sort of way, combining flavors from various world cuisines. There is live jazz some evenings.

Well, if you want to consider someplace outside of Whittier but possibly on your way to a freeway, there are some decent ones in Fullerton, Hacienda Heights, etc.

You didn't state if you have any budget or cuisine preferences.

Good fish tacos can be had at Taco Nazo at La Habra, but that's really casual and cheap, more like fast food. Good British Pub at Fullerton at Olde Ship. Going down towards Brea it's Taps for higher end seafood & steak.

Whittwood Town Center in Whittier Blvd opened up a food court area. There's also a good old reliable but dull Ruby's Diner there too. Your normal chains like Panera and Maui Hawaiian BBQ, but there's a new Thai and Japanese restaurant (not fast food) there that I unfortunately hadn't gotten around to yet.